RF ATTEN to 10dB. Remove the
I RF INPUT and apply the microwave
las snown in Fig. 3-8. Change to band 4
and switch the FREQ SPAN/DIV to
\492P
has Option 01, adjust the
|aximum marker amplitude. It may be
|just the FREQUENCY for best marker
ker to center screen then check the accu-
pht divisions of the display. Deviation
Hz/div.
h.
Remove the comb generator from the RF INPUT and
connect the Marker Output of the time mark generator to
the RF INPUT. Set the FREQ SPAN/DIV to 50 MHz, and
apply 20 ns time markers to the 492/492P input.
Calibration—492/492P Service Vol. 1 (SN B030000 & up)
Performance Check
i.
Tune toward the lower frequency end of the band until
50 MHz markers are displayed over the center eight divi
sions (10 MHz markers will appear between each 50 MHz
marker).
Check the accuracy of the 50 MHz/div span.
and 10 GHz SPAN/DIV selections
cannot be checked; however, their
Itly related to the 100 MHz and 200 MHz
k. Reduce the FREQ SPAN/DIV to 20 MHz and apply
50 ns (20 MHz) markers. Check the span/div accuracy.
FREQUENCY RANGE to band 1
JGHz Option 01). Re-establish a REF
and tune the FREQUENCY to
'SPAN/DIV to 50 MHz and select a
WDWIDTH of 1 MHz.
I. Change the RESOLUTION BANDWIDTH to 10 kHz,
then repeat this procedure to check the FREQ SPAN/DIV
accuracy from 10 MHz down to 1 MHz, using Table 3-6 as a
guide to relate time markers to frequency span/div settings.
503 Main Frame
492 Spectrum Analyzer
O
o
o
RF In
Comb Generator Module
Fig. 3-8. Test equipment setup for checking span and timing accuracy.
3-21
